CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso • Actualmen Actualmente, te, el desarrollo desarrollo y mantenimient mantenimiento o del software software se concibe mediante un enfoque basado en los l os procesos. • Se asume asume que se debe contr controlar olar o supervis supervisar ar la cantidad cantidad de incidencias, fallos, defectos y cambios durante el desarrollo y explotación del sistema. • Estos Estos valores valores permiten permiten que los gestores gestores de proyecto proyecto puedan puedan conocer cuál es el estado de los productos que se van generando. • Lo habitual habitual es que estos estos datos datos procedan procedan de las activi actividades dades de aseguramiento de calidad del software realizadas durante el proyecto. • Habitualme Habitualmente, nte, los datos datos sobre sobre problemas problemas en los productos productos que se generan durante los proyectos de sw. se relacionan con los procesos que han dado lugar a dichos productos. • De esta manera, manera, se intenta intenta caract caracteriza erizarr los procesos procesos a través través de los resultados o salidas que obtienen.
Jorge Salamanca Escorial
1
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso • Por otra parte, parte, también también es necesario necesario medir atribut atributos os específicos específicos de los propios procesos, como el tiempo empleado, su coste y el esfuerzo requerido. • La relación relación entre entre las medidas medidas de los resulta resultados dos obtenidos obtenidos en un un proceso y los recursos usados en él permitirá medir la productividad. • Éste es es un atributo atributo por por el que existe existe un gran interé interéss en la industria industria del sw. ya que es clave para estimar el coste y el esfuerzo de los proyectos.
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación • La estimación es el proceso de predicción de la duración , esfuerzos y costes necesarios para realizar todas las actividades y obtener todos los productos asociados a un proyecto. • Se hace necesar necesario io tener en cuenta cuenta multitud multitud de aspectos aspectos que que afectan afectan a la estimación como son la complejidad del proyecto, su estructuración, el tamaño, los recursos involucrados y los riesgos asociados. • La estimación estimación es siempre siempre difícil difícil de realizar realizar por diversas diversas razones razones:: – No existe un un modelo modelo ni una fórmula fórmula de estimació estimación n universal. universal. – Son muchas muchas las personas personas implicada implicadass en el proyecto, proyecto, desde desde la alta
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación • La estimación estimación es siempre siempre difícil difícil de realizar realizar por diversas diversas razones razones:: (cont.) – La estimación estimación suele hacerse hacerse superficia superficialment lmente, e, sin tener en cuenta cuenta el esfuerzo necesario para hacer el trabajo. – La rapidez rapidez del cambio cambio de las metodolo metodologías gías y las tecnologí tecnologías as no permiten la estabilización del proceso de estimación. – Los estimadore estimadoress pueden no tener tener experiencia experienciass sobre aquello aquello que pretenden estimar. – Es estimador estimador suele hacer hacer la estimación estimación en función función del tiempo que que a él le llevaría en realizar el trabajo, sin tener en cuenta la experiencia y formación de la persona que realmente lo realiza.
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación • Además Además de los métodos métodos algorítmic algorítmicos, os, se suelen suelen utilizar utilizar por sus sencillez los siguientes: – El juici juicio o del del expe experto rto – La ana analo logí gía a – La ley de Parkins Parkinson on – La mej mejor or ofe ofert rta a – Las estimac estimaciones iones global y detallada detallada
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación – El juicio del experto En gran parte de los proyectos Sw, en el momento de estimar el coste de los desarrollos, se observa que el método utilizado se basa principalmente en juicios emitidos por uno o varios expertos avalados por su experiencia en entornos similares y apoyados, en algunos casos, en datos objetivos obtenidos de proyectos anteriores y almacenados. El método de Wideband Delphi es una aproximación que se puede definir como un protocolo protocolo multipas multipaso o cuyo fin es hacer coincidir coincidir la opinión opinión de un grupo de expertos evitando así estimaciones parciales de individuos aislados.
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación – El juicio del experto Los pasos dentro del método de Wideband Delphi son: • El coordinador coordinador del equipo equipo técnico de expertos presenta presenta a cada uno de ellos ellos una especificación de estimación.
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación – El juicio del experto
Este método tiene como desventaja evidente el alto coste en tiempo y recursos humanos necesarios para su implantación, así como la subordinación al nivel de experiencia y conocimientos en el entorno que
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación • Además Además de los métodos métodos algorítmic algorítmicos, os, se suelen suelen utilizar utilizar por sus sencillez los siguientes: – La analogía Se hace la estimación de un proyecto nuevo por analogía con las
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación • Además Además de los métodos métodos algorítmic algorítmicos, os, se suelen suelen utilizar utilizar por sus sencillez los siguientes: – La ley de Parkinson C.N. Parkinson formuló en 1987 unas leyes que, reformuladas, se
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TEMA 3
Medidas del proceso Modelos de estimación • Además Además de los métodos métodos algorítmic algorítmicos, os, se suelen suelen utilizar utilizar por sus sencillez los siguientes: – Las estimaciones global y detallada La estimación global, también llamada descendente , se hace teniendo en
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TEMA 3
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación Estimación de costes y esfuerzo
MODELO SLIM (PUTNAM) • El model modelo o SLIM SLIM (Softw (Software are LIfec LIfecycl ycle e Model) Model) lo propu propuso so Putna Putnam m basándose en su base de datos de proyectos [Putnam, 1978 ].]. • Se apoya apoya en en el modelo modelo teór teórico ico de de Norden Norden-Ra -Rayle yleigh igh sobre sobre la form forma a de la curva de desarrollo de los proyectos. Curva que se obtuvo basándose basándose en datos datos recopilado recopiladoss por Norden Norden y las descripcio descripciones nes analíticas de las curvas realizadas por Rayleigh. • Se afirma afirma que el modelo modelo es aplicable aplicable a proyect proyectos os de tamaño tamaño superior a 70.000 LOC.
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación Estimación de costes y esfuerzo
MODELO SLIM (PUTNAM) • Putnam Putnam define define lo lo que él él denomi denomina na la ecua ecuació ción n del soft softwar ware, e, basándose en que la cantidad de trabajo para desarrollar cualquier software se puede concebir como el producto del esfuerzo realizado en un periodo de tiempo. • Así, Así, se se puede puede escrib escribir: ir: L = C * K 1/3 td4/3 • Donde el el tamaño tamaño del producto producto L (en LOC) LOC) represent representa a una cierta cierta medida de su funcionalidad y se asume que es proporcional al producto K * t
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación Estimación de costes y esfuerzo
MODELO SLIM (PUTNAM) • Putnam Putnam define define C como como la const constant ante e de product productivi ividad dad del del proceso proceso.. De esta manera la productividad no esta definida con precisión, aunque se se supone que que incluye incluye un conjunto conjunto de factores factores que que afectan afectan a toda la organización, tales como la gestión del proyecto, el manejo de buenas especificaciones, diseños, codificaciones, inspecciones y pruebas, el estado de la tecnología, la experiencia de los miembros del grupo. • Los valores valores bajos bajos de esta esta constante constante se asocian asocian a entorno entornoss
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TEMA 3
CALIDAD DEL SOFTWARE
Medidas del proceso Modelos de estimación Estimación de costes y esfuerzo
MODELO SLIM (PUTNAM) • Alguno Algunoss valores valores de C propu propuest estos: os: C
Entorno
2000
Desarrollo sin metodologías, pobre documentación, modo de ejecución no interactivo.
8000
Buena metodología, revisiones acordadas, interactivo.
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación Estimación de costes y esfuerzo
MODELO SLIM (PUTNAM) • Basándose Basándose en las las tendencias tendencias establec establecidas idas en su base base de datos, datos, Putnam Putnam dedujo que que la relación relación entre entre el esfuerzo esfuerzo no es lineal: lineal: K = L3/ C3 * td4 • De esta segunda segunda ecuación ecuación se deducen deducen interesant interesantes es conclusiones conclusiones.. El factor factor td al estar estar afectado afectado por una potencia potencia tan tan alta indica indica que pequeñas variaciones en el tiempo de entrega pueden modificar
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CALIDAD DEL SOFTWARE
TEMA 3
Medidas del proceso Modelos de estimación Estimación de costes y esfuerzo
MODELO SLIM (PUTNAM) • Este modelo modelo a recibid recibido o críticas críticas por el hecho hecho de que las las curvas curvas de